How I Organize My Math Materials

I keep most of my math materials in these two areas:

My blue shelving holds the materials I use the most: centimeter cubes, 1 inch colored tiles, protractors (I didn't even notice that my sign was misspelled until this picture was right in front of me, oh my!), rulers, dominos and compasses.

Well, well, well. I have no manipulatives for math. And I'm teaching it next year for the 1st time-6th grade. Guess I need to get busy. I had some stuff when I taught K 3 years ago-hmmmm....wonder if I can find them AND if I can use them.

So if I could only buy 3 types of manipulatives for 6th grade math what would you suggest? :)

I use my red/yellow counter a lot for teaching integers, but with CCSS most of those skills are moving to 7th grade. You can use the cm cubes or 1 in. tiles for ratios and proportions. I also use the cm cubes for volume and probability. A set of white boards with a coordinate grid on them is nice too. I have some, but not a class set.